Just ordered both a large and small elipse! Looking forward to putting these on my pannier and helmet!

These are not really good on a helmet as they will crease.. helmets have compound curves and the small decal will crease.. In order to avoid this, one needs a sticker designed to fit on compound curves.

I was able to use a hair blow dryer and heat the small sticker up a bit and get it to work without a crease. I started with the very center of the sticker and just warmed it up and it worked okay. The sticker was a little out of shape in the end but you could hardly notice since it is on a curve anyway.

I don't have the helmet anymore and can't find a picture but if you want to try that it might work for you as well.